1-Distrust anyone who says "Emergency" when it isn't. No one's life or property is in danger here, this is not an "emergency sale". It might be a "distress sale" but that's something else entirely.
2-There's a 1972 Yorktown 33 listed on Yachtworld in Cali for $19,000 ASKING price. this one is worth $48,000? Really? And, what's a "certified marine mechanic" ? Never heard of that. Sounds like someone who got tired of chasing seals, doesn't know how to do his own maintenance, and wants to bamboozle some newbie with fancy words.
3-Price includes mooring? Yeah, right, the one he's had to ABANDON because of the seals.
But, if you've got the money and feel the boat is worth it, that's all it takes.